|
Loans and Allowance for Credit Losses, PCI, by Credit Quality Indicator (Details) (USD $)
In Millions, unless otherwise specified
|
Mar. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2008
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
$ 29,729 |
$ 30,968 |
$ 58,797 |
|
Total Commercial [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
3,502 |
3,977 |
18,704 |
|
Commercial and Industrial Loans [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
191 |
259 |
4,580 |
|
Commercial Real Estate Mortgage [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
1,839 |
1,970 |
5,803 |
|
Commercial Real Estate Construction [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
767 |
877 |
6,462 |
|
Foreign Loans [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
705 |
871 |
1,859 |
|
Purchased Credit-Impaired Loans [Member] | Total Commercial [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
3,502 |
3,977 |
|
|
Purchased Credit-Impaired Loans [Member] | Commercial and Industrial Loans [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
191 |
259 |
|
|
Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Mortgage [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
1,839 |
1,970 |
|
|
Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Construction [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
767 |
877 |
|
|
Purchased Credit-Impaired Loans [Member] | Foreign Loans [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
705 |
871 |
|
|
Pass [Member] | Purchased Credit-Impaired Loans [Member] | Total Commercial [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
667 |
898 |
|
|
Pass [Member] | Purchased Credit-Impaired Loans [Member] | Commercial and Industrial Loans [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
96 |
95 |
|
|
Pass [Member] | Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Mortgage [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
341 |
341 |
|
|
Pass [Member] | Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Construction [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
222 |
207 |
|
|
Pass [Member] | Purchased Credit-Impaired Loans [Member] | Foreign Loans [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
8 |
255 |
|
|
Criticized [Member] | Purchased Credit-Impaired Loans [Member] | Total Commercial [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
2,835 |
3,079 |
|
|
Criticized [Member] | Purchased Credit-Impaired Loans [Member] | Commercial and Industrial Loans [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
95 |
164 |
|
|
Criticized [Member] | Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Mortgage [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
1,498 |
1,629 |
|
|
Criticized [Member] | Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Construction [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
545 |
670 |
|
|
Criticized [Member] | Purchased Credit-Impaired Loans [Member] | Foreign Loans [Member]
|
|
|
|
| Purchased Credit Impaired Loans by Credit Quality Indicator [Abstract] |
|
|
|
| Purchased Credit Impaired Loans |
$ 697 |
$ 616 |
|